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“THIS is live, at 14,000 feet,
over Spain,=
8221;
a man shouted over the roar of the wind as he and a group of fellow skydive=
rs
plunged toward the earth near Madrid. Before deploying their parachutes, th=
ey
created human formations spelling out the letters H, O, N, D and A. The jump
was broadcast live on Channel 4 in Britain last week, during a three-minute
commercial break from a reality television program. Honda Motor,=
the
Japanese automaker, has gone to particularly great lengths with its skydivi=
ng
stunt in Britain. Instead of having a pair of comedians in a TV studio read
jokes from a script, the ad involved 19 skydivers doing a dangerous jump th=
at
was subject to the vicissitudes of the weather as well as the synchronizati=
on
of two airplanes. Honda and i=
ts ad
agency in Britain, Wieden & Kennedy, developed the idea to illustrate t=
he
tag line “Difficult is worth doing,” which is being used to pro=
mote
a new version of the Accord.

Note: Do these questions in the English system, g =
=3D 32
ft/s2, , 60 mph =
=3D 88
ft/s.Question: (a) If =
no friction
exists find the time to fall the distance above? (b) If no friction exists =
find
the speed of the skydivers when they get to the ground? (c) Actually skydiv=
ers
reach a terminal velocity (constant velocity) of 140 mph. If so, find the t=
ime
for them to reach the ground with this typical air friction acting? (d) Ske=
tch
the forces acting on the skydivers as they fall at the terminal velocity? A=
nswers
(a) ~29.6 s(b) ~ 946.6 ft/s,=
645
mph (c) ~ 68.18 s , (d) Do sketch showing t=
wo
forces on skydivers.

On e force is due to gravity down, and second force=
is
due to frictional forces acting up.